Comments author display…

I’ve been using WordPress 2.8.5 for awhile now and it works well and easy to manage. There are couple of “features that makes me scratch my head as to how to fix it?

When the visitor adds a comment that includes his/her website, WordPress automatically creates a link for the website for the visitor’s name; it looks something like this:

visitor’s name

It’s getting boring removing the links by editing the visitor’s post. Is there a way to disable this feature of WordPress that would prevent creating this link?
TIA…

Cr00zng